Make the the script executable using chmod +x /etc/init.d/ipv6 and test if it’s working by executing /etc/init.d/ipv6 start. If it works and you have a working IPv6 (verify using ping6 ipv6.google.com) then enable it as a startup script with /etc/init.d/ipv6 enable.

The next step would be, to add the new henet interface to the wan zone of the firewall. Either use Luci (Network/Firewall/Zones) or edit /etc/config/network:

config 'zone'
option 'name' 'wan'
option 'network' 'wan sixxs'

You need an iptables rule for enabling the IPv4 firewall to accept IPv6 connections (protocol 41) from the PoP tunnel endpoint even if they are not related to existing connections. So add the following line to ‘/etc/firewall.user':